asp.net - panel visibility java script -


<asp:panel id="filterpanel" runat="server" cssclass="filterborder"                        visible="false"> <table width="100%" cellspacing="4">         <tr>             <td class="filterpanelfiltercontrolwidth">         <uc:filter id="filter" runat="server" />     </td>     <td class="centerincell">         <controls:brbutton id="gobutton" runat="server" text="go"                     causesvalidation="true" skinid="verysmallbutton"                     onclick="gobutton_click" />     </td>     </tr>    </table> </asp:panel> 

i setting visibilty of filter panel false.. default..

on click of show/hide filter want change visible = true. doing javascript..like this

function showhidefilter() {     if (document.getelementbyid('ctl00_contentplaceholder1_ctl00_filtershowhidehiddenfield').value == 'true') {         document.getelementbyid('ctl00_contentplaceholder1_ctl00_filterpanel').style.display = 'none';         document.getelementbyid('ctl00_contentplaceholder1_ctl00_filterpanel').style.visibility = 'hidden';         document.getelementbyid('ctl00_contentplaceholder1_ctl00_filtershowhidehiddenfield').value = 'false';         return false;     }     else {         document.getelementbyid('ctl00_contentplaceholder1_ctl00_filterpanel').style.display = 'inline';         document.getelementbyid('ctl00_contentplaceholder1_ctl00_filterpanel').style.visibility = 'visible';         document.getelementbyid('ctl00_contentplaceholder1_ctl00_filtershowhidehiddenfield').value = 'true';         return false;     } } 

however becaus ethe visible set false.. runtime error required object set null..below..

document.getelementbyid('ctl00_contentplaceholder1_ctl00_filterpanel').style.display = 'inline';  document.getelementbyid('ctl00_contentplaceholder1_ctl00_filterpanel').style.visibility = 'visible'; 

where going wrong..!!

when visible="false" , runat="server", object not sent server client. cannot make visible javascript, need on server.


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